Rb-Sr and Sm-Nd Mineral Isochron Ages of the Metamorphic Rocks in the Namaqualand Metamorphic Complex, South Africa

M. Yuhara, T. Miyazaki, J. Ishioka, S. Suzuki, H. Kagami, N. Tsuchiya

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Rb-Sr and Sm-Nd isotopic studies were carried out for metamorphic rocks in the Namaqualand Metamorphic Complex, South Africa. The metamorphic rocks give the Rb-Sr mineral isochron ages (whole-rock - biotite - felsic fractions) of 844±85 Ma and 811.6±6.6 Ma for the lower granulite zone and of 776.5±5.4 Ma for the upper granulite zone. The rocks yield the Sm-Nd mineral isochron ages of 1071±18 Ma (whole-rock - garnet - felsic fractions) and 1067±158 Ma (whole-rock - hornblende - biotite rich fraction - felsic fractions) for the lower granulite zone and of 1052.0±3.6 Ma and 1002.5±1.4 Ma (whole-rock - garnet - felsic fractions) for the upper granulite zone. These age data suggest that the granulite facies metamorphism took place at 1060-1000 Ma, and that the rocks cooled down at 850-780 Ma. The Sr and Nd isotopic compositions of metamorphic rocks are different between the lower and upper granulite zones.

Original languageEnglish
Pages (from-to)771-779
Number of pages9
JournalGondwana Research
Volume5
Issue number4
DOIs
Publication statusPublished - 2002 Oct

Keywords

  • Granulite
  • Namaqualand
  • Rb-Sr whole-rock - mineral isochron age
  • Sm-Nd whole-rock - mineral isochron age
  • South Africa

ASJC Scopus subject areas

  • Geology

Fingerprint

Dive into the research topics of 'Rb-Sr and Sm-Nd Mineral Isochron Ages of the Metamorphic Rocks in the Namaqualand Metamorphic Complex, South Africa'. Together they form a unique fingerprint.

Cite this